Microsoft announce the retirement of System Center Global Service Monitor. Currently an SA benefit for System Center customers, this service will retire on 7 November, 2018 and customers are recommended to move to web application monitoring capabilities powered by Azure Application Insights. Current GSM customers will be notified of the retirement, and may migrate tests and alert rules to Azure Application Insights at no cost.
Find the announcement and some FAQs here: http://bit.ly/2JeRh9u.